Elevator device.



C. JOHNSON & A. SAHLEN.

BLBvAToR DEVICE.

APPLIOATION FILED JULY 31, 1911.

Patented May 7, 1912.

2 SHEETS-SHEET l.

C. JOHNSON & A. SAHLEN.

ELEVATOB. DEVICE.

APPLICATION I'ILED JULY 31, 1911.

Patented May 7, 1912.

-2 SHEETS-SHEET 2.

coLuMmA PLANuaR/Pu cu., WASHINGON. n. c.

CHARLES JOHNSON AND .ALBERT SAHLEN, 0F CHICAGO, ILLINOIS.

ELEVATOR DEVICE.

Specification of Letters Patent.

Patented May *7, 1912.

Application filed July 31, 1911. ySerial No. 641,542.

To all vwhom t may concern:

Be it known that we, CHARLES JOHNSON and ALBERT SAHLnN, both citizens of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Elevator Devices, of which the following is a description.

Our invent-ion is particularly adapt-ed for use in connection with that class of elevators in which a pair of hoisting pulleys are arranged in proximity to one another, and over which a line common to the device extends to two alternately moving platforms. Devices of this kind are very common at present in connection with building operations, for the purpose of hoisting necessary materials.

Our invention consists in the novel construction, arrangement and combination of parts in a device of this kind, and more particularly shown in the drawings, and pointed out in the specification and claims hereto.

In the drawings, in which the same reference characters indicate like or corresponding parts: Figure 1 is a partial top plan of the hoisting pulleys and frame therefor, for a device embodying our invention. Fig. 2 is a partial side elevation of the hoisting wheels and connecting parts, Fig. 3 is a sectional view substantially on line 3, 3 of Fig. 1, and Fig. 4 is a perspective View of the preferred form of pawl employed with a device embodying our invention.

In the drawings, 1, 2 are suitable framework, the horizontal cross-pieces 1 having arranged between them suitable bearings for rotatable cable pulleys 3, 3, around the periphery of which the hoisting rope is preferably passed a plurality of times, as

shown. On the marginal face of each of said pulleys is arranged a ratchet ring 4, the teeth of which preferably extend in opposite directions, as shown. In proximity to each of said wheels is arranged a pawl 5, as clearly shown in Figs. 3 and 4, adapted to engage with the ratchet rings 4, to permit the particular pulley wheel engaged to freely rotate in one direction only. As shown in Fig. 3, the pawl 5 is connected at its upper end to the support or pivot 6, a spring 7 tending to hold the free end of the pawl in engagement with the ratchet 4. Between the ends of the pawl is connected an arm 8, which is at its outer end connected to the bell-crank 9, 12. The engagement between the bell crank 9 and the arm 8 is by a slot and bolt connection, as shown at 10, 11, permitting the free end of the pawl to ride upon the ratchet teeth when the pulley is reversed, and to operatively engage with the ratchet teeth when it is attempted to rotate it in the opposite direction. The bell cranks 9,'12 for the two pulleys are suitably arranged so that their free ends 12 are connected by a link 13. A lever 14 pivotally supported o-n the structure, as at 15, and connected to the link 13, gives control of the pawls in their engagement with their cooperating ratchets. As the lever is moved in one direction or the other, it will cause one pawl to engage with its ratchet and simultaneously disengage the other, so that the pulleys may be rotated alternately, first in one direction and then the other, to alternately raise and lower the elevator platform supported thereby.

16 is a notched yoke for the lever 14, which is provided with a longitudinal movable dog 17, arranged to engage in one of the notches 18 in the yoke 16. A spring 19 serves to hold the dog in operative engagement with the notches in the yoke, and the rod 2O connected to said dog serves to retract the` same in order to move the lever backward and forward, and to engage the dog with any desired notch. It may be arranged as preferred, that when the lever 14 is centrally positioned in the yoke 16 with the dog 17 engaging the central notch therefor, that both of the pawls may either be engaged with or disengaged from the ratchets. This, however, is a matter of construction, and may be arranged as preferred by the party erecting the device or manufacturing the various parts.

21, shown in Fig. 2, indicates the top portion of one of the elevator platforms, while 22 indicates the rope or line connecting the platforms and passing over the pulleys.

In operation, the parts being in the position shown in Figs. 1 and 2, the platform there shown is ready to descend, while the cooperating platform is below receiving its load. The pulleys are operated in a direction to lower the platform shown and raise the other, and at this moment the levers are preferably in the position shown in Fig. 1, which releases the pulley shown to the left from connect-ion wit-h its coperating pawl 5, but places the pawl coperating with the pulley to the right in operative connection with the ratchet thereof, so that in case of accident, the pawl would engage with the ratchet and prevent the loaded platform from falling.

Any preferred means may be employed to drive the device, either by animal or other power, our improvement being adapted to operate equally well with either.

Having thus described our invention, it is obvious that various immaterial modifications may be made in the same without departing from the spirit of our invention, hence we do not wish to limit ourselves to the exact form, construction or combination of parts herein shown and described, or uses mentioned.

What we claim as new and desire to secure by Letters Patent is l. In a device of the kind described, a pair of hoisting pulleys, each provided on one of its side faces wit-h a ratchet ring, the teeth of which project laterally from said face, a pair of elevator platforms, a line common to bot-h extending from the platforms and over said pulleys, the pulleys being adapted to rotate first in one direction and then the other, to alternately raise and lower the two platforms, in combination with a pawl for each ratchet ring in proximity thereto and arranged to alternately engage with their coperating ratchet rings, and an intermediate connection between the two arranged to the side of the pulleys substantially as shown whereby to operatively lengage one pawl as the other pawl 'is disengaged from its ratchet.

2. In a device of the kind described, a pair of cable pulleys arranged to rotate in either direct-ion substantially in unison, and each having upon its side a ratchet ring, the teeth of which extend laterally, in combination with a pawl for each pulley adapted to swing laterally arranged to coperate with the ratchet ring thereof to limit the movement of said pulley to one direction only, resilient means arranged to hold said pawls normally in engagement with their coperating ratchet rings, and intermediate means common to both locking mechanisms, whereby upon releasing one of the same from the ratchet ring, it will simultaneously engage the other pawl with its coperating ratchet.

3. In a device of the kind described, a rotating pulley provided on its side with a ratchet ring, in combination with a pawl arranged to normally engage said ring, an arm attached to said pawl, a controlling arm therefor connected to said arm with a slot and pin' engagement, whereby said pawl and arm are permitted a lateral movement, permitting the pawl to ride over the ratchets when the wheel is rotated in the reverse direction, but to engage with said pawl and prevent the rotation of the wheel in the opposite direction, and the pawl being adapted to be wholly disengaged from said ratchet at will.

4. In a device of the kind described, a rotating pulley having a grooved periphery and a ring member secured to one side thereof which latter is provided wit-h later ally extending ratchet teeth, in combination with a pawl arranged to one side of the pulley and adapted to normally engage said ring, an arm att-ached to said pawl, a con trolling arm therefor connected to said arm wit-h a slot and pin engagement, whereby said pawl and arm are permitted a lateral movement, permitting the pawl to ride over the ratchets when the wheel is rotated in the reverse direction, but to engage with said pawl and prevent the rotation of the wheel in the opposite direction.

5. In a device of the kind described, the combination of horizontally extending frame parts, rotatable pulleys arranged between the frame parts and having bearings adjacent the tops of said frame parts, said pulleys having on one face thereof annularly disposed laterally extending ratchet teeth, a pawl for each pulley arranged be tween one of said frame parts and the ratchet face of the pulley, the pawls being pivotally supported at their upper ends and arranged to engage at their lower ends the said ratchets, an arm projecting laterally from each pawl intermediate its ends, pivotally supported bell crank levers one for each arm, and a connecting arm extending longitudinally of the frame parts and connected at opposite ends to said bell crank levers.

6. In a device of the kind described, the combination of horizontally extending frame parts, rotatable pulleys arranged between the frame parts and having bearings adjacent the tops of said frame parts, said pulleys having on one face thereof annularly disposed laterally extending ratchet teeth, a pawl for each pulley arranged between one of said frame part-s and the ratchet face of the pulley, the pawls being pivotally supported at their upper ends and arranged to engage at their ends the said ratchets, an arm projecting laterally from each pawl intermediate its ends, pivotally supported bell crank levers one for each arm and having a pin and slot connection therewith, and a connecting arm extending longitudinally of the frame parts and con nected at opposite ends to said bell crank levers.

7 In a device of the kind described, the combination of horizontally extending frame parts, rotatable pulleys arranged between the frame parts and having bearings adjacent the tops of said frame parts, said pulleys having on one face thereof annularly disposed laterally extending ratchet teeth, a pawl for each pulley arranged between one of said frame parts and the ratchet face of the pulley, the pawls being pivotally supported at their upper ends and arranged to engage at their lower ends the said ratchets, an arm projecting laterally from each pawl intermediate its ends, pivotally supported bell crank levers one for each arm, and a connecting arm extending longitudinally of the frame parts and connected at opposite ends to said bell crank levers, a loop projecting outwardly from the frame to a point beyond said connecting frame and an operating arm pivoted at one end to a suitable support and intermediate its ends to said connecting arm and having a holding engagement with said loop.

8. In a device of the kind described, the combination of spaced pulleys each having on one face thereof an annular ratchet ring with the teeth project-ing laterally from said face, an elongated arm projecting between the pulleys, a bell crank lever one at each end of said arm and pivotally connected thereto, pivoted dogs one for each ratchet pivotally supported, and an outwardly projecting arm for each dog connected to the adjacent bell crank lever.

9. In a device of the kind described, the combination of spaced pulleys each having on one face thereof an annular ratchet ring with the teeth projecting laterally from said face, an elongated arm projecting between the pulleys, a bell crank lever one at each end of said arm and pivotally connected thereto, spring pressed pivoted dogs onet for each ratchet pivotally supported, and an outwardly projecting arm for each dog having a movable connection therewith.

In testimony whereof, we have hereunto signed our names in the presence of subscribing witnesses.

CHARLES JOHNSON. ALBERT SAI-ILEN.

Witnesses:

ROY W. I-IILL, CHARLES I. COBB.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

